14:11, after disconnecting the bone parent of the chest bones, the chest control bone should move freely. But I can’t move it at all. What might be the reason?
I added the detailed explanation on how to fix this issue on the submission comments. However, to summarise the cause of the issue here. There was a copy-transform constraint that was not allowing the Chest control to move (it was being pinned to the DEF-Chest)
Clearing the constraint and parenting the Chest control to the Torso control will rectify the issue.
But it raises another question. Why did we have to make the Copy Transform constraint in the first place if the constraint has to be cleared at the end?